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Finding the Fourth Proportional to 395.81, 593.98 and 139.31

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Solution

The fourth proportional to 395.81, 593.98 and 139.31 is: 209.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.81 : 593.98 = 139.31 : x
  2. Step 2: Convert to fraction form
    395.81/593.98 = 139.31/x
  3. Step 3: Cross multiply
    395.81x = 593.98 × 139.31
  4. Step 4: Simplify right side
    395.81x = 82,747.35
  5. Step 5: Solve for x
    x = 82,747.35/395.81
  6. Step 6: Final answer
    x = 209.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.